KARIN, who looks no older than 21, has an innocent and pure baby face. With little experience in sex and a shy, timid personality, she feels uncertain during her first time, but gradually becomes more aware with each act of foreplay. Her hands bound, her entire body teased and stimulated repeatedly, her mind and body slowly grow hotter. Finally, she becomes aware of her own feelings and resolves to accept them. In that moment, she takes a new step forward.